Transport spectroscopy of NS nanowire junctions with Majorana fermions
Entity
UAM. Departamento de Física de la Materia CondensadaPublisher
The American Physical SocietyDate
2012-11-12Citation
10.1103/PhysRevB.86.180503
Physical Review B 86.18 (2012): 180503
ISSN
1098-0121 (print); 1550-235X (online)DOI
10.1103/PhysRevB.86.180503Funded by
We acknowledge the support of the CSIC JAE-Doc program and the Spanish Ministry of Science and Innovation through Grants No.FIS2008-00124/FIS (P.S.-J) and No. FIS2009-08744 (E.P. and R.A.). This research was supported in part by the National Science Foundation under Grant No. NSF PHY05-51164Project
Gobierno de España. FIS2008-00124/FIS; Gobierno de España. FIS2009-08744Editor's Version
http://dx.doi.org/10.1103/PhysRevB.86.180503Subjects
FísicaRights
© 2012 American Physical SocietyAbstract
We investigate transport through normal-superconductor nanowire junctions in the presence of spin-orbit coupling and magnetic field. As the Zeeman field crosses the critical bulk value B c of the topological transition, a Majorana bound state (MBS) is formed, giving rise to a sharp zero-bias anomaly (ZBA) in the tunneling differential conductance. We identify novel features beyond this picture in wires with inhomogeneous depletion, such as the appearance of two MBSs inside a long depleted region for B<B c. The resulting ZBA is in most cases weakly split and may coexist with Andreev bound states near zero energy. The ZBA may appear without evidence of a topological gap closing. This latter aspect is more evident in the multiband case and stems from a smooth pinch-off barrier. Most of these features are in qualitative agreement with recent experiments. We also discuss the rich phenomenology of the problem in other regimes which remain experimentally unexplored
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Google Scholar:Prada, Elsa
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San-Jose, Pablo
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Aguado, Ramón
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